How does the structure of the alveoli allow for its function of gas exchange? Alveolar sacs have space to hold mucus that makes gas exchange easier.
Alveolar sacs rely on valves to ensure that air flows only in one direction.
Alveolar sacs are located within muscles that contract, which increases gas exchange.
Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

a covalent bond, specfically triple bond